Vaporous Djinn {2}{U}{U}
Creature — Djinn
Flying
At the beginning of your upkeep, this creature phases out unless you pay {U}{U}. (While it's phased out, it's treated as though it doesn't exist. It phases in before you untap during your next untap step.)
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Cards that do something similar expected a card that isn't here?
Reports become test cases the matcher is graded against before an update ships. Delvefall isn't a chatbot guessing, it compares the printed rules text of every card with plain math, and examples like yours decide which differences should count.
Warping Wurm 90%
$0.62#31154
"At the beginning of your upkeep, this creature phases out unless you pay {2}{G}{U}."